单选题：What does the experiment mentioned in paragraph 4 prove?____

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What does the experiment mentioned in paragraph 4 prove?________________ A．There are more enzymes in decal drinkers' urine sample.
B．there are more melatonin concentrations in caffeine drinkers' urine sample.
C．Decal drinkers produce less melationin.
D．Caffeine drinkers produce less sleep hormone.

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Mary gets up at the same time every morning.A．arises B．raises C．arrives D．stands

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She has been the subject of massive media coverage.

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2012年1～3季度，杭州市实现生产总值是衢州市与丽水市总和的（　　）倍。

2012年1～3季度，杭州市实现生产总值是衢州市与丽水市总和的（　　）倍。A．4.4 B．4.9 C．5.2 D．5.7

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